__pthread_cleanup_pop

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
  1. void __pthread_cleanup_pop(int , _pthread_cleanup_info* )
    version(!CRuntime_Glibc && !Darwin && !FreeBSD && !DragonFlyBSD && !NetBSD && !OpenBSD && Solaris)
    extern (C) nothrow @nogc
    void
    __pthread_cleanup_pop
  2. void __pthread_cleanup_pop(__pthread_cleanup_t* , int )

Meta